Is you browser set to specific language setting like "according to system files" or set in the opera settings anything other than English?
British English. In the settings.
It was that initially. I might make it clear if I used a multilanguage Setup, also the whole properties of it.
But it seems to me just when installing, the thing used my position/locale/whatever: it loaded speeddials like Yandex.ru, Gismeteo.ru, Rambler.ru, other_stuff.ru, etc.; I deleted some; in search engines, there are Wikipedia and DuckDuckGo that seem like ".com", but the rest is .ru including the default Google.
Checked it out.
Yes, multiple languages in settings.
The file was "Opera 36 0 2130 65 Setup.exe". Checked its properties - nothing special; can something like that carry some additional "extra data" affiliate to the source of embedding the download offer or something? The file seems legit, but I'm not certain if the download button/offer was affiliated or embedded on some site, from where it could carry - some stuff? 😕
Here's the file, to be thorough: http://nashobmen.org/fo/get/3406202/689075/Opera_36_0_2130_65_Setup-wap_sasisa_ru.exe (reuploaded).